package com.example.dangdangbackend.config;


import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import java.util.List;

/**
 * @author LENOVO
 */
@Slf4j
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {
    /**
     * 设置静态资源映射
     * @param registry
     */
    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
      log.info("开始静态资源映射....");
       //将文件进行映射访问,静态资源映射
        registry.addResourceHandler("doc.html").addResourceLocations("classpath:/META-INF/resources/");
    }

    /**
     * 拓展mvc框架的消息转换器
     * @param converters
     */
    @Override
    protected void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        log.info("拓展消息转换器");
        //创建消息转换器对象 将Controller对象的返回结果，转回Json再返回给页面
        MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();
        //设置对象转换器，底层使用jackson将java转为json
        messageConverter.setObjectMapper(new JacksonObjectMapper());
        //将上面的消息转换器追加到mvc框架的转换器集合中
        converters.add(0,messageConverter);
    }




}
